Website Enhancement and Development on LAMP technology

We are a small seed stage startup and need effective agencies that helps startups. Our website is www.begintoheal.com. It’s a site to book sessions with 200 practitioners in holistic wellness in New York and to buy online courses, meditations, read articles etc Competitors include- Mind Valley, DailyOm, [login to view URL], Zocdoc My site is fully custom built on LAMP technology hosted on AWS HIPAA server in New York. I go live for beta launch in few days but I feel my current team cannot built a fast speed robust system, it keeps getting product glitches continuously and performance of the site is slow. Looking for experienced LAMP technology providers What are all the API integrations? - Stripe - [login to view URL] - Others - Webinar - Vidyo - Plivo - Paypal Immediate need- 1) Develop subscription model on my site for $10 per month each user will get $10 off each video session built on the site, 2 free online courses, 2 meditation audios and 2 webinars they can attend each month. 2) Add option for a main medical center to be added to list of practitioner, a center will have multiple practitioners under it. The flow of booking with each practitioner under it can be independant. We do payment processing and scheduling on our site with our own custom calendar build. Practitioners can put their availability for video calls and in person meetings separately on the site.