in order to produce good fruit our “branch” needs to be nourished and strengthened by being linked to the “root” (God).
A branch which is separated from the plant will die.
Our faith is strengthened and nourished by being with other believers and taking time to dig into His Word, confess or sins and sing His praises.
Certainly, you don’t “need” to go to church. But I firmly believe that your faith is strengthened and fed when you are among other believers.
As Ecclesiastes 4:12 says:
12 Though one may be overpowered,
two can defend themselves.
A cord of three strands is not quickly broken.