Hear me out, next season they'll be 12 teams meaning there will be 11 week fixtures, there will be 6 matches pero fixture and you. You can make it work by having 3 days and playing 2 matches on them or maybe 3 days of 2 matches (although I'll get burnt). If you do 1 fixture a week it will take about 2,5 months to complete.
This will allow to not have to make groups and play a lot more valorant overall.
The season could look like:
Kick-off (1 month)
Masters 1 ( 1 week of play + 4 weeks of rest ~= 1 month)
Split 1 ( 2,5 months)
Playoffs ( 2 weeks ~= 0,5 months)
Masters 2 ( 2 weeks of play + 4 weeks of rest ~= 1,5 months)
Split 2 (2,5 months)
Playoffs (2 weeks ~= 0,5 months)
Champs (1 month of play + 2 weeks of rest ~= 1,5 months)
Total: 11 months, leaving 1 month for off-season, prolly should adjust from the times of rest between masters