I have two 20a amp breakers I replaced recently due to tripping off. They continue to do the same with the new 20a breakers. Is it time to upgrade to a 30 amp or is there something wrong with the wiring or the pool pump which is what these breakers operate?

The circuit will need to be troubleshooted, using an amp meter to see if the motors are drawing more than normal. There may also be a short in the circuits. Better to check out the problem before upgrading the breakers to 30 amp, which would need all #10 wire be pulled.