So here are some tips in order to win a game :
Tip 1 : Playing What Your Team Really Needs
In drafts , You need to keep an eye on whatever is going on in the Draft , Try to communicate with the banner and other people and settle up what you want to pick , Some people are experienced enough to "fill" but letting someone inexperienced in tanks or supports to play them in draft might become really risky for your team , So if you think you can supp or tank , Then go for it
Tip 2 : Map Awarness and Soaking
In games , You need to look at the map at the very least once per 30 secs (Or more if you can) ... Know where your teammates are going , When to join them , When to depart from them and Ultimately , Know when to soak
Soaking is one of the best ways to carry a game , It can sometimes change the outcome of a game , You can pretty much soak as much as you want as long as you don't get ganked , This tactics + Map Awarness = More exp / No exp for enemy team , Since being aware of the map means you can dodge ganks and of course , Your death to the enemy team
Tip 3 : Having No Deaths
Do NOT die when you can live for the fight , Unless you are 100% sure that you will get a benefit by dying , If you can win the objective by dying then go for it , If you can get at least 1 kill before dying then go for it , It really depends on the map / Enemy team / Your hero
Tip 4 : Prevent Overextending
A helpful tip that can be solved by pinging several times on the map , When your team pushes you need to be careful when to fall back , If your team keeps pushing till the very end then chances are very high that the enemy team will prevail and destroy your team
When everyone are heavily damaged , They need to fall back to the Altar , try advising them to do it
Tip 5 : Objective
Related to Tip 2 , Map Awarness helps a lot in knowing when the objective starts
If your enemy team's level is higher than your team's (as much as it gives them powerful talents/ults , example level 9 vs level 10 OR level 18/19 vs level 20) Do not do objective , You are not forced to do it , Try soaking until you reach their level and start a team fight (DO NOT start a team fight when enemy team has advantage of having a higher level and has already won the objective)
My rank is Platinum 5 , By using this tips I got out of Silver/Gold (also I did climb to Platinum 4 once) I don't know if I helped you all out or not , I hope you all will get a better rank afterwards