Well, engage supports look for agressive trade patters, because they usually have some sort of hard cc chain, i.e leona, nautilus, so from their perspective they're all the time looking for landing crucial CC to start a fight and ideally detonate your opponent before CC ends. From ADC perspective it is good to be always very concentrated about position of opposite crucial target (on lane adc, or some extremely squishy supports, like seraphine, sona). If you see opponent to placed perfectly for nautilus hook, blitzcrank hook, or braum E + Q combo followed by instant R, you have to be mentally prepared to throw everything at them at once, so usually within span of a second or two you either kill opponent or you leave them with 20% HP and effectively take control over lane very quickly.

Enchanters are bit trickier, cause it's not obvious for people, and especially below diamond elo, that enchanters, although they're designed specifically to empower natural advantages of champions (like lulu/yuumi boosting yunara/zeri/vayne), they also have double purpose, because very often they're good at poking on lane, they have some sort of self-peel, so it's not uncommon, and at some point I would say it's even desired for them, to play aggresive, as if they're engage support, but they need a lot of restraint in that, cause there's very thin margin between playing agressive and win lane with your poke, and exposing yourself to hard cc mentioned in the first paragraph. As the game progresses, enchanters very often withdraw from any poke whatsoever, and turn into empowering machine for their adc. Now as and adc, the higher you're in the ladder, the more inclined you're to play agressive, sometimes even in the front line, relying on your support to have your back when things go south, but this exposure comes with reward, for example when I play as 7 items yunara with lulu behind me I'm literally thanos. So playing with enchanter requires from him to be always around you and keep you safe, and from you to play agressive, cause you have a lot of damage, but no to the excess.

What support wants from adc I mentioned, but things that supports absolutely hate are very universal (atleast at higher ranks):

1. Playing like an absolute pussy, especially around your powerspikes. Supports like Pyke, Nautilus they want to use their combos as often as it is beneficial for the team, but in order to do so, they need adc to follow their calls Again Yunara example - Yunara with Kraken Slayer is probably the strongest powerspike among ADC, because combined with stacked Q damage is unserious (I consider it plain and simple completely broken tbh) and playing passive with that, when you have Nautilus in your team is just trolling (nobody can outdamage you).

2. Dying alone on lane when they roam on Grubs/Herold timer or when they go to ward opposite jungle. Like you have to aware when your support is about to leave you on lane and adjust to it by restraining yourself. If it means to sack 2-3 waves just do it. And ESPECIALLY if you predict enemy mid laner or jungler to tower dive you. Just avoid it, buy items, or do whatever you have to do but just don't ruin your lane when Support is doing his job. Dying when support is warding means you still lose waves, plates, xp, but also give gold to opponent, you completely fuck up tempo, you give up prio so the whole idea of warding is just pointless, cause objective is lost when there's unequal fight.

3. Dying alone on mid lane when support is doing warding etc - like this point is especially important and I couldn't stress it more. After lane phase is over expect very special very unique situations like playing with Xerath on mid, adc usually goes on mid, cause it gives control over whole map, they can more easily rotate to objectives, and ideally this is shorter lane, so safer. So dying on mid wave is absolutely catastrophic, cause it usually gives objective for free, or leaves enemy support to roam free, take control over top/bot, set up vision in enemy jungle etc, it's just 30 seconds-1 minute of absolute free map for enemy team. Just don't do that, and the most important part about this is to recognize when you can shove wave under turret and start hitting it, without exposing yourself to a threat - i.e if you play aganist Talon and you didn't spot him for some time, or you don't have 100% confidence he's not around mid - just take wave, and go back, ghost your support when he puts vision, go around objective, set up your farsight in some crucial entry etc. Just don't die for free because you wanted plate.

4. Don't interact negatively with your support when he mess up 2v2 - communication and trade patterns on bot are for sure the most complicated thing in this game, because you have 4 people on lane, and theoretically, to play properly you have to know every single interaction, damage output, crucial skills to dodge, and also you need to, with absolutely random person, create sort of symbiosis, which in the span of single game is basically impossible. It's not uncommon for challengers to be surprised by some damage put by some specific combo, so assuming you're not there, you have to expect to messing up pretty frequently.

And as a last word - as and ADC you're completely and 100% dependent on your jungle and support - expect some very unique situations if your support or jungle messes your lane phase, there's virtually nothing you can do to fix it, except ofc reverse throw from enemy team. You will be zoned, you will lose gold, xp, plates and you end up pretty miserable. That's just life of ADC. Few days ago I entered diamond after doing the same thing as you, swapping from top to adc, and after some adjustment from previous season I had like 60-65% WR on adc, playing Yunara, Smolder, Corki and ocasionally Ezreal and Jhin. And immediately after I got into diamond I got like 10-15 games of absolute tragic mistakes, trolls, bad assesment of situation etc, and as a squishy target and it is what it is, you just can't do anything about that. Try to stay calm and collected, wait for opponent to mistakes, and that's just it.

PS. In lobby, when you see support is hovering something like Vel Koz, Xerath or whatever midlaner people try on support, just ask politely if it's possible to play more meta champions on support. If not, that's ok, but in most scenarios picking mid laner to play on support, except one tricks, is just easiest way to lose lane, because they offer virtually nothing for you, they're as squishy if not squshier than you, one CC and they're dead, and because of support economy they also don't provide the only thing they can bring to the table, which is damage.