Do you think i should start fallout 3 again?

hi, i bought fallout 3 goty edition late last year and got really into it, ended up playing it all the time just exploring, got to rivet city and doctor li in the main story and then went off and did the mothership zeta side quest, i am at level 18 and have some awesome weapons, but i stopped playing it in November to play assassins creed brotherhood and red dead redemption, and finished them both last week, so now I've got my eye on fallout again, but I'm not sure if i should start it from the beginning, or continue where i left off.. anybody got any advice? thanks in advance