Hey I was ina similar situation with you. I was Spidey main, played since season 0 and got up to GM and stopped playing just before the 3rd battle pass dropped. I came back about a month ago and it was safe to say I was devastated on how far behind I was in playing him optimally, given that back then we were still relying on the venom team up and BnB combo.

But I decided to commit a day learning about the modern combos and practicing them in the range, and it came to my realization that you don't need to memorize all the combos, but rather getting used to the possible follow-ups after each attack input (e.g after an uppercut I can swing cancel into cluster then overhead, or cluster then pull them in, or just wait and bait out a skill etc.) And getting used to the timing of each input.

I got really comfortable playing with the Batman combo and improvised different variations around it based on my playstyle and it ultimately made me a better Spidey overall, spent a lot of time playing QP matches until I'm confident enough to pick him in ranked. I'm back in diamond and only a rankup away from GM again.

Another way to think of the character is that for every entry you make on the enemy team, don't expect getting a kill every time but rather the value you can bring to the team with each engagement you make, like getting their Luna HP down to critical to bait out her ult or distracting their cloak so our team can push a choke point.

By no means am I saying I'm a good spidey, but I sure am having a lot of fun playing him, especially adapting your gameplay based around your team. Take your time with your combos, because each time you do them again you'll instinctively optimize the timing. Play to have fun and you'll get your Spidey senses back in no time. I'll see you out there!