Seems like that you are overreacting; regardless of how long you have been staying away from crypto trading I believe nothing has changed significantly since you are not trading and you can start trading like before with your usual technical analysis which might be still profitable if you are doing them in right way.

Instead of focusing on developing an all new trading strategy, I guess adopting an existing strategy and then fine-tuning it according to your trading habits might save you time and efforts. Plus, always have more than one strategy as back up plans may be needed at unexpected times.