@Anjaneenp
Please fill in a general location in your profile so BNutters can give climate appropriate advice, and possibly point you to local resources, such as sources of potting media, and local sources of other supplies.
First, beyond the brown tips, your juniper looks healthy. You've had it nearly a year. So the point is, your horticulture is "pretty okay", make no drastic changes in how you are growing this juniper.
The brown tips can be the results of letting it dry out too much, just once can do it, so just maintain consistent care. The overall health says you are doing okay.
Repotting, don't repot until you have an appropriate media on hand. I recommend any of the commercial bonsai mixes, or a home made mix. I prefer the standard pumice, lava, akadama mix, or any of the alternatives. Pumice and fir bark roughly 2 parts pumice, one part fir bark is a mix I have used with good results.
Avoid "potting soil", pro-mix, Farfaad BX, "cactus mix" and other potting mixes. They really are not that bad, but they are a fine particle, and will require annually repotting. We like to use a coarse mix with mostly mineral particles that will allow going 3 to 5 years between repotting.
Junipers are fairly tolerant of "out of season" work. They are one of the last to be repotted in spring. Much of the USA and Canada it is still safe to repot Junipers. Zone 8 & 9 in southern and southeastern USA it's too late, and the desert southwest including California, it's too late. But the Midwest and north we can still be repotting junipers.
So depending on your location, you could certainly still be repotting your juniper.
There are "second seasons" good for repotting that are not spring time, but they are VERY location dependent. So if you miss repotting season in spring, there are alternatives. Let us know your location and we can help.