Molten Strike Iron grip point blank Marauder passive tree

So i just made this passive tree for a MS marauder, i'm wondering about what to link with my molten strike, as i want to use it for AOE and Single target, i feel like i need to scale the projectiles AND the base hit, any advice on gear, different skill tree, and most of all, as i said, SUPPORT GEMS, i'm a little clueless tbh ! Thankyou in advance for feedback, once i actually make the build, i'll post progress in gearing and maybe even some videos ;)

https://www.pathofexile.com/passive-skill-tree/AAAAAwEAxthYYz38jM_2SF8_FCDvDlBH5FGXeQmWOQ7rCYVS2WGtjc9-dqzqGPcy-OtyqXzZZFIUcfPdu-2sqk4ywaPZfA48aGWRzlnzF-HiYYIHOlIaOCb4MHfyQTJ-vJ-GYJBVE0xZ_vxLGJFhUicvFE3vTjrYAedeE-w4MokBkacwIVVAoIV7gpt35S3Sn8ss-9w9eu8hYGZUmjuKIgd1BS108eFzJyDApnTtGNsppaIA2sEUdaaN8B8Es4TvpMJ1TmjywGapJ2XwkGyHaqmUhNlHfr02ZU2-p3XL6mKwq8SCivDpRpLQEuE=

Great Day of gaming to you all !