I would maintain a 2X/week per muscle group frequency. But you can cutvolume significantly, up to 2/3rds from your normal volume (so if you were doing 6 sets for legs 2X/week, you can go 2 sets)
What you should NOT cut is the intensity. That’s the key to maintenance, you can reduce volume and frequency but you have to maintain intensity (defined here as weight on the bar or %1RM). This will maintain your max strength for quite some time.
If you feel like it’s slipping, plug in a couple of weeks of focus on max strength, bump up the volume to get it back up and then move back to maintenance.
So warmups, a couple of heavy sets at or near your best weights and move on. In fact, low volume heavy work can make an excellent primer for power work. You get ap otentiation effect from the heavy work without tiring yourself out and may find that your power work (whatever it is) goes better
Alternately, do the powerwork first and heavy maintenance work afterwards. So warmups -> power work -> maintenance strenght work -> go home.
Much of this depends on what else you’re doing in the week or on that day, of course. The above is just general commentary.