Have you experimented with longer cycles? An alternative method I’ve tried is 90 minutes of intense work and 90 minutes of light work/relaxing.
With a little bit of practice the 90 minute break becomes shorter.
People’s optimal time ratios depend on them and need to be experimented with.
If you start from an extremely distracted place (only managing a couple of minutes at a time) then even 45 minutes will be hard at the start.