As we know, a guard is expected to use for about three month to maintain anonymity .
Tor Entry Guards - Whonix
In general, users should not interfere with Tor guard persistence or the natural rotation of entry guards every few months. At the time of writing, the Tor client selects one guard node, but previously used a three-guard design. Guards have a primary lifetime of 120 days.
However, in some countries, even if I configure a bridge, after about just one month, I cannot connect to this bridge anymore.
Should I:
1.switch to use vpn+tor, rather than bridges.
2.change a bridge immediately when I cannot connect to original ones.
3.wait till Firewall don’t block me anymore.