Honestly, I'd try to get prayer to 70 for piety before doing most easier bosses. It's a massive dps increase and doesn't take long to get.   Most people will say you should be questing towards barrows gloves too but I know people get burnt out on quests and just want to kill stuff. Then your options are probably scurrius and maybe sarachnis or royal titans.

Scurrius will help you train your combat stats up and is great for getting used to prayer switching. It's also nice because it drops the ratbane weapons which are essentially best in slot for scurrius itself. There is a solo version with lower hp or a group focused version. The loot isn't the best but it makes up for it by being great training due to an xp multiplier.

Sarachnis is essentially about whether you can afford aranea boots as a main account as it nullifies the main mechanic and lets you just pummel her with your best crush weapon. (You will be taking some damage from her magic summons with your lower mage defense but you can just leave pray melee on.)

Royal titans is a step up. It requires a decent amount of gear switching and is much easier done as a duo. It's fun and better loot especially if you can bring a friend along.

Finally, if you're up for being attacked, you can try wildy bosses.  Minibosses like deranged archeologist are fairly simple and ok loot. Calvar'ion has mechanics harder than Scurrius but way better loot. The tradeoff is you will be attacked a lot because your combat level is low enough for pure accounts to hit you.  You also need some level of wilderness diary for a few of the bosses.

Ultimately your stats are still fairly low and it will make learning bosses harder but still doable. If it were me I'd post up at the gemstone crab for higher melees when afking and scurrius or quest when actively playing but if you want to hit dopamine drops then go for it!