Don't sit at HR49, get yourself to HR50 so you can start doing all the events which are live right now on all platforms. They are a great way to get new armor sets with good perks and slots. Do your absolute best to get the Temporal Mantle, doing so could be very difficult, but if you're on PC right now I imagine there will be a lot of people willing answer an SoS. The Temporal Mantle series of missions starts with the Special Assignment called "The Blazing Sun". Also, try to finish ALL the optional quests up to and including the 8* optionals, this will unlock a new optional mission that will be useful to crafting some nice weapons (Lunastra weapons).
Once you have the Temporal Mantle, farm the hell out of "The Greatest Jagras" Event mission, it'll only be around for another week (gets replaced with a similar quest, but shittier mob - Lavasioth). This mission can net you 32+ decorations or more per run. It is an AMAZING way to get the decorations you may want. Try to craft a set of gear that has a lot of Slots, even if the innate perks aren't that great for you. You can fill those slots with useful survival decorations like Vitality / Divine Protection, both can help you survive a few hits.
If you can, try to find a Kulve Taroth session, look for some on Twitch. Read up a bit on the event, then farm it until you can craft the Beta Chest and the Gamma Legs. Doing so will could also get you some of the best weapons in the game (pure RNG though).
If you want to watch come guided, I would suggest watching stuff by Arekkz Gaming and TheGameEconomist, but have excellent guides about everything dealing with MHW.