I have a lot of people who are very important to me.
I have a lot of friends and family who mean a lot to me.
この場合、次のような言い方ができますよ。
ーI have a lot of people who are very important to me.
「私にはとても大切な人がたくさんいます」
people who are very important to me「私にとってとても大切な人たち」
ーI have a lot of friends and family who mean a lot to me.
「私にはとても大切な友達や家族がたくさんいます」
to mean a lot to me で「私には大きな意味を持っている」
ご参考まで!