Honestly samee over here, I am currently experiencing the same thing. I used to be very active back in 2018, botted my main at almost 2k total but I was very dumb about it, like easily 12 hours a day but I was babysitting it the whole time, just trained many diff skills in this 12 hours. I dont know how good my luck was or the anti bot was just that bad back in 2018... but I tried coming back into OSRS because I quit after i got banned - altho i botted mainly but i still invested so much time in the game.
anyways like I was saying, i tried coming back to the game again earlier this week, i already got 3 accs banned ngl. And this happened all under 24 hours, all i did was bot tut island but i would press some certain things(ik botting tut island isnt ideal), then use perfect fighter on chickens, and do some quests with stealth quester bot, and i get banned. I got one delayed banned when i had almost 40/40/40 combat stats when i used explv walker to GE.
So what I am doing now is baby sit big time in the last acc i played for 2/3 days is: change my ip first, then train some combat stats by hand for a while, and then bot 1 or 2 quests.. Then I do a bit the next day. I hope I dont get banned soon, im playing mainly by hand then im going to switch to botting for a couple hours like max 4/3 a certain skill with breaks, i didnt get there to do this but I will try to.
Thing is my theory is the quick bans that happen is mainly detected because of the age of the acc, so dont start strong, take it easy on botting in the very beginning. I will try to keep you updated if anything changes... But right now im actually a decent amount of levels without a ban
edit: 14 hours later: that didnt take long ugh, banned again.. I was babysitting it, but I almost fully trained all the combat skills 40/40/30 myself. Then I went questing, 1 hour into it got disconnected and i was banned. This time ill try doing tut island myself instead of botting i guess.
new update: i just purchased vip so i could have mirror mode, because it seems like stealth is just really detected from what I am hearing. I was really careful and got banned, so im just going to see how mirror does.