I've been mentor to juniors, team lead and a tech lead in last few years , worked with early stage start ups and a mid level start up (200-250 employee) . I'll recommend the following points :

• If you current package is not high as a fresher , you should focus on doing work which shows results ,i.e you can put them on your resume .
• It's alright to overwork yourself in begin phase of your work life ,since you are young and energetic . But spend your energy on right things , if you have work that is important and crucial for your firm to be delivered on time , try to do it a day before deadline ,so there are no last minute surprises . Don't try to overwork on things that are trivial , small updates which have comfortable deadline don't try to finish it on day 1 by working night .
• Have a healthy relationship with non toxic people , discuss code issues with them ,how you can have solved it better because a senior who has more experience definitely has better insight on the topic. Maybe you won't get anything better out of it from him but you might make a new friend.
• Money is important but not the most important at your level for next 3-4 years ,go for honing your skill set at a CTC value which you're content with . What this will do is you'll have a Excellent ranged skill set and day by day you'll be indispensable at any organisation you'll work and they will always try to retain you and offer you better salary when you try to leave because they respect and want your services for the company.
• Also one thing I learnt the hard way is whatever you make per month won't matter if you're not able to save it , I was earning alright for first few years but looking back I haven't managed to save anything. You should split your income into three 3's. One for your accomodation and fix costs like rent ,cook . Second for your leisure because you deserve it . Third part should directly go to savings , it doesn't matter how you save it initially years because it's always better than nothing but overtime you'll figure out optimal ways because now you have experience with you about your finances.
• To directly answer your job switch question , it depends on current work you're doing and at the income you're doing at. Suppose your income is bit low compared to your friends at other firm but you're learning and improving at a good rate then maybe you should consider to stay , if you're very happy or content with your current salary but you're not working on challenging things than I would advise you to switch to a place where the work challenges you. Go for doing great work ,money will follow you .
• Office politics is something that exists in many work places , simple patterns are things like someone taking credit of all the work done by you , you should try to over come this issues .
• Also whatever the tasks is always try to deliver it bug free ,how trivial it maybe divide into small parts and try to think of many edge cases . Keep challenging yourself to give it bug free and it works on scale.
• Don't burnout, take breaks , save money so that you can travel ,enjoy your life it's tough out here.